Improved elievator



G. SCOTT. ELEVATOR.

No. 91,775. Patented June 22, 1869.

iinitrd, iatrs fitment fltjijiirr.

GEORGE .SC OTT,.O F LOUISVILLE,'KENTUCKY.

Letters Patent No. 91,775, dated June 22, 1869.

DEPROV'ED ELEVATOR The Schedule referred to'in these Letters Patent and making par of the same,

Figure2 is a top view of safety-clamp or clampinglever.

Figures 3 and 4. are top views of other safety-clamps, which may be used instead of the' one shown in fig. 2. Similar letters of reference indicate corresponding parts.

My invention relatesto that class of elevators which performs its function by means of a sliding, platform, hoisted or lowered with the aid ofa cord and pulleys.

It consists in providing a band, lever, and safetyclamps, in connection with said platform, which, in case the elevating-rope should break, effectually secure theplatform to the sides of the frame, so as to prevent its fall, and inan improved construction and arrangement of its several parts, as will be hereinafter more fully described.

In the drawings-- A' is the frame, the uprights of which are cleated on their outer sides. g I

Aare vertical slots'in the cross-piece of. the frame, 'in thesides of which the pulleys have their bearings.

The hoisting-cord is secured to the frame at the eye-bolt A Bare common pulleys, double grooved. v

G isthe platform, which is of ordinary construction, excepting the horiz'ontal groove 0 across theface of its slides O, to admit the jaws of the clamps, and two vertical grooves, O, at the centre of the beam, into which fits an iron or other band, D.

D is an iron or otherband, which is made large enough to permit it to slide up and down on the beam,

and in the top of which the hoisting-rope D is fastened.

D is a leather strap, passed around the ends of the safety-clamps, the ends of which are drawn through the lower end of the .band D. I

E is a lever, which is pivoted to the rimam of the platform at e. Said lever has a forke end, which passes under the beam and over the ends of the clamps.

E is a rope or cord, secured to the upper end of the lever, and carrying a balance-weight, Ef.

F are safety-clamps, which are composed of a rigid arm and jaws. These jaws-are nearly square, and clasp the cleats on the uprights. \Vhere the arm passes through the slide, and on its upper edge, a groove of sniiicient width'and depth is made, to allow it to play freely in the slot in which it Works.

F is a safety-clamp, having loose jaws, similar in shape to those of F. These'jaws are riveted to a slightly-curved arm at f. This arm has a cam-shaped end.

F is a safety-clamp, composed of a gently-curved arm, having aT-piece for its head. When this clamp is used, the interior surfaces of the uprights of -the' frame must be grooved in the form of a T, to receive .its head.

The operation of my invention is as follows The platform being at rest, with the leather strap D passed far enough through the iron band to maintain the arms of the clampsin a horizontal position, a sulficient pull on the rope D will hoist the platform on thenprights of the frame. When it has reached the desired height, pass the disengaged end of the rope I) through the eye-bolt A, where it may be securely fastened.

In the event of the rope D breaking, the fali of the platform, with the force of the balance-weight E",'hy means of the rope E, is sufiicient toraise the upper armof the lever E, which presses its hooked portion upon the ends of the clamps. This brings two of the sharp edges of the clamp-jaws into such close contact with the uprights that it is impossible for the platform to descend.

Having thus described the nature and operation of my invention,

What I claim as new. and desire to secure by Letters Patent, is-- 1. The clam ping-levers F, and their combination with the uprights G, and the upright poi-tionsof the frame A, constructed substantially as shown and described.

2. The combination of the lever E and the clamp lug-lever 1*, substantially as shown and described.

3. The combination of the lever E, cord or chain E and balance-weight E, substantially as shown and described.

4.. The arrangement of the band D and strap D,

with reference to the clamping-levers F, substantially as shown and described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

Witnesses:

R. B. CALDWELL, I. Porn.

GEORGE SCOTT. 

